Function swap (proxy<F>)

friend void swap(proxy& lhs, proxy& rhs) noexcept(noexcept(lhs.swap(rhs)));

Overloads the std::swap algorithm for proxy. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs).

This function is not visible to ordinary unqualified or qualified lookup. It can only be found by argument-dependent lookup when proxy<F> is an associated class of the arguments.

Example

#include <iostream>
#include <numbers>
#include <string>

#include <proxy/proxy.h>

PRO_DEF_FREE_DISPATCH(FreeToString, std::to_string, ToString);

struct Stringable : pro::facade_builder                           //
                    ::add_convention<FreeToString, std::string()> //
                    ::build {};

int main() {
  pro::proxy<Stringable> p0 = pro::make_proxy<Stringable>(123);
  pro::proxy<Stringable> p1 = pro::make_proxy<Stringable>(std::numbers::pi);
  std::cout << ToString(*p0) << "\n"; // Prints "10"
  std::cout << ToString(*p1) << "\n"; // Prints "3.14..."
  std::ranges::swap(p0, p1);          // finds the hidden friend
  std::cout << ToString(*p0) << "\n"; // Prints "3.14..."
  std::cout << ToString(*p1) << "\n"; // Prints "10"
}